On Wed, 3 Sep 2014, Robert Swindells wrote:
Is there any special configuration needed to use 4k sector disks efficiently ? I have a couple of SATA drives with 4k sectors, the disklabels for them give a sector size of 512 bytes but 'atactl identify' shows the true sector size. I used 'newfs -S 4096' on one of them, a new SSD, but am wondering whether to copy stuff off the other one and repartition.
Even with netbsd-5, I've had no problems with 4k disks providing: - all partitions are aligned at 4k boundaries (including within RAIDframe)- the FS was formatted with newfs -b 32768 -f 4096 (N.B. didn't use -S option)
Failing to do either of these gave catastrophic write performance especially on a RAID-5 RAIDframe (due to the MRW cycle).
-- Stephen